Thanks! Yes, it's really a stunning watch. Sometimes I think about replacing it with "The Royal Oak", the classic 15202, but I somehow prefer the modern look of the 15500 and I would also miss the seconds hand. The 15500 is a bit large for my small wrist (16.5cm), but I think it's still OK.
I think I will get a PP 5711 instead of the 15202 and keep the 15500
The PPF v4 seems to be OK, but I will probably wait for a version with a properly sized crown. I know about the 3KF, but that one also has it's flaws.